Need Opinions for Different Cable Manufacturers/Cable Designs

I am not going to recommend a make, though I have Focal Utopia’s and what I use does sound excellent with them, but might push your budget because you don’t tend to find them used, for good reason.
What I do suggest is that whilst good design of experiment says "change one item at a time" the issue in most hifi cases is you will not see the full improvement until you have removed, or at least balanced out the bottlenecks though the system. I had bought an upgraded AES/EBU (within a dCS Vivaldi system) and a pair of same make XLR’s for variable output DAC to Vitus Power AMP. But was waiting on my Speaker cable upgrade and in the interim had been lent a pair of speaker cables from the same manufacturer but 2 grades down from the AES / XLRs.
Whilst the speaker cable made some improvement of the previous I was disappointed (less experience at that point) in the difference of swapping the AES/XLR’s in and out with against the ’basic’ Van Damme cables that had come with the dCS, However, when the speaker cable (and also actually a clock cable) were upgraded to the same level I could then hear a significant improvement.

So whether you home trial or find a dealer who has Sopra 2/3’s for an initial trial I would make sure you are getting them to either step up through a full system cable up grade, in either case start at base with your cables or same level if at dealer and then:

1 Increment speaker cable

2 Increment XLRs

Repeat loop until no further improvements, or you don’t trust yourself with the price increase on the next one.... but you will still have to know.

Of course according to naysayers it will never change and according to the (sometimes correct) diminishing returns fans it will reach an asymptote.

However, one situation that can confound the asymptote is when there is a change in for example the dielectric in an upper level cable. Then that can (and IMO and all who have experienced it in my system does) produce a bigger change than the still appreciable increment of those lower down in the range.
Happy testing.

OP

For affordable OCC copper cables, look at Zavfino....excellent copper and geometry and affordable. Also Anti-Cables Flex 4.2 are excellent and reasonable

I am also going to mention taking a look at some of the brands that @kennyc mentioned - Iconoclast and Zenwave. I do also use AcousticZen Hologram speaker cables as well and am impressed with their musical and open presentation.

While design is critical with cables, I have come to believe that using UPOCC copper and silver can really improve sound quality. I had some Iconclast TPC interconnects and recently compared them to their UPOCC cable (same exact design, just different copper) and the UPOCC was definitively better.

I also have recently had the opportunity to listen to a new Zenwave all UPOCC silver interconnect and it is a keeper. Dave at Zenwave is great to talk with and can guide you through his whole line at different price points. He is very focused on making great cables at different levels using the best quality cable and connectors he can.

I have tried most of the best cables in the industry. Too many to list and most of what has been mentioned here. End game cables are made by Inakustik. A German manufacturer that has done a lot of research whose designs have been proven in recording studios throughout the world. 

 @kinarow1 I have extensive experience with DHLabs cables and you can’t go wrong with them. Great bang for your buck! In my experience, you can do better if you spend more. I also have used Audience ICs; in my system, they sounded thin and I resold them after extensive auditioning. I know you didn’t ask for other cable recs, but for what it’s worth…I’ve used a wide variety of cables priced within your budget used, including Harmonic Technology, Acoustic Zen, virtual Dynamics, PureNote, Kimber, DIY Neotech and Furutech. Each product had virtues and limitations. I ended my cable experiments nearly 10 years ago, after stumbling across a pair of VonGaylord Chinchilla ICs. I am not a fan of their power cords, but VonGaylord IC cables bring the best out of my system. You can find used Chinchilla for prices well within your budget. My experience auditioning cables is quite some time ago and there may be better options available now, but the VonGaylords are worthy of an audition.

Be patient. Used examples of all the cables you listed eventually will be offered on online marketplaces. I’ve bought and sold dozens of used cables. If you’re careful, you will recover your money when you resell. I’ve had good experiences using the Cable Co lending library.

Good luck and good listening!